<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <h2 :style="[{color: 'red'}, baseStyle], baseStyle2">{{message}}</h2>
    <h2 style="font-size: small" :style="getStyles()">{{message}}</h2>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
    const app = new Vue({
        el: '#app',
        data: {
            message: 'simplelu',
            baseStyle: {fontStyle: 'italic'},
            baseStyle2: {fontSize: '50px'}
        },
        methods: {
            getStyles: function () {
                return [{color: 'red'}, this.baseStyle]
            }
        }
    })
</script>
</body>
</html>